文件拷贝 files nio

byte [] body = Files.readAllBytes(Paths.get("c:/file001","Desert.jpg")); 把文件从一个文件夹 拷贝到 另一个文件夹

String path ="c:/fileTest/"+fileName+"."+nameStr;

File file =new File(path);

Files.copy(new ByteArrayInputStream(body),file.toPath());